Klondike Solitaire is probably the best-known solitaire in
the world. Many people don't even realize that other games exist.
Though the name may not be familiar, the game itself certainly is.
This is due in no small part to Microsoft's inclusion of the
game in every version of Windows, though their naming the game
"Microsoft Solitaire" only added to the confusion about the game's proper name.

Klondike Solitaire is probably the best-known solitaire in
the world. Many people don't even realize that other games exist.
Though the name may not be familiar, the game itself certainly is.
This is due in no small part to Microsoft's inclusion of the
game in every version of Windows, though their naming the game
"Microsoft Solitaire" only added to the confusion about the game's proper name.

Spider solitaire is one of best-known two-deck solitaires, despite the fact that it's an extremely difficult game to win.
It seems to inspire a fanatic devotion among some players. Perhaps the rareness of a win makes it all
the more satisfying when, once in a while, it does come out.